#racket on 2019-03-06 — irc logs at freenode.irclog.whitequark.org

2018-11-14 19:02 lexi-lambda changed the topic of #racket to: Racket v7.1 has been released: http://blog.racket-lang.org/2018/10/racket-v7-1.html -- Racket -- https://racket-lang.org -- https://pkgs.racket-lang.org -- Paste at http://pasterack.org

00:01 <harber> px helps

00:02 lavaflow_ has quit [Read error: Connection reset by peer]

00:02 Fare has quit [Ping timeout: 255 seconds]

00:03 lfish has quit [Ping timeout: 256 seconds]

00:03 lavaflow_ has joined #racket

00:04 <harber> i was able to get a result with --> #px"[[][[:digit:]]+[]] ([[:ascii:]]+$)" ... but... woof, that's awful-looking

00:12 selimcan has joined #racket

00:13 <lexi-lambda> harber: You could use \\d instead of [[:digit:]], and you could also use \\[ and \\] instead of [[] and []], but I don’t know if you’d find that better or not.

00:13 <harber> i tried using \\] and it barfed at me about unmatched brackets

00:14 <harber> maybe it's before i was using px?

00:14 <bremner> rudybot: (regexp-match #px"\\[[a-z]+" "[hello")

00:14 <rudybot> bremner: your sandbox is ready

00:14 <rudybot> bremner: ; Value: '("[hello")

00:14 <lexi-lambda> rudybot: eval (regexp-match #px"\\[\\d+\\] ([[:ascii:]]+)$" "[123] hi")

00:15 <rudybot> lexi-lambda: your sandbox is ready

00:15 <rudybot> lexi-lambda: ; Value: '("[123] hi" "hi")

00:15 <lexi-lambda> In my experience you basically just always want to use #px…

00:15 <harber> hah, that's fair. new to racket, fumbling my way through

00:16 <bremner> there's parser-tools/lex and parser-tools/lex-sre also

00:16 FreeFull has quit [Quit: Rebooting again..]

00:16 <selimcan> Hi! Is it a bug or a feature that when editing Scribble files in DrRacket, it fills (I guess that's the word. I press rightAlt-q) lines at 60 characters although the 'Maximum character width guide' is Preferences is set to 79 chars?

00:17 <selimcan> Maybe there is some other option to control that I don't see

00:17 FreeFull has joined #racket

00:24 efm has quit [Ping timeout: 240 seconds]

00:24 amz3 has quit [Ping timeout: 250 seconds]

00:24 efm has joined #racket

00:44 _whitelogger has joined #racket

01:07 ubLIX has quit [Quit: ubLIX]

01:11 efm has quit [Ping timeout: 250 seconds]

01:45 amz3 has joined #racket

01:45 harber has quit [Quit: Page closed]

01:48 widp_ has joined #racket

01:58 catonano_ has joined #racket

02:02 catonano has quit [Ping timeout: 250 seconds]

02:02 catonano_ is now known as catonano

02:13 pera has quit [Ping timeout: 245 seconds]

02:36 jao has quit [Ping timeout: 250 seconds]

02:42 pera has joined #racket

02:47 acarrico has quit [Ping timeout: 245 seconds]

02:54 acarrico has joined #racket

02:59 acarrico has quit [Ping timeout: 255 seconds]

03:08 pera has quit [Ping timeout: 240 seconds]

03:17 orivej has quit [Ping timeout: 252 seconds]

03:24 efm has joined #racket

03:32 efm has quit [Ping timeout: 245 seconds]

03:36 aeth has quit [Ping timeout: 245 seconds]

03:38 aeth has joined #racket

03:38 selimcan has quit [Remote host closed the connection]

03:56 ZombieChicken has quit [Ping timeout: 256 seconds]

03:57 ZombieChicken has joined #racket

04:16 FreeFull has quit []

04:21 widp_ has quit [Ping timeout: 240 seconds]

04:27 ym has quit [Ping timeout: 268 seconds]

04:30 ym has joined #racket

04:44 ym has quit [Ping timeout: 252 seconds]

04:44 pie__ has joined #racket

04:45 ym has joined #racket

04:48 pie___ has quit [Ping timeout: 255 seconds]

04:48 pera has joined #racket

05:41 endformationage has quit [Ping timeout: 245 seconds]

05:41 Fare has joined #racket

05:52 pera has quit [Ping timeout: 252 seconds]

06:07 selimcan has joined #racket

06:09 YuGiOhJCJ has quit [Quit: YuGiOhJCJ]

06:13 selimcan has quit [Ping timeout: 240 seconds]

07:12 Fare has quit [Ping timeout: 255 seconds]

07:18 winny has quit [Quit: internet is full of wankers]

07:21 widp_ has joined #racket

07:33 orivej has joined #racket

07:43 orivej has quit [Ping timeout: 250 seconds]

07:45 ng0 has joined #racket

08:10 orivej has joined #racket

08:31 ubLIX has joined #racket

08:31 ng0 has quit [Quit: Alexa, when is the end of world?]

08:36 widp_ has quit [Ping timeout: 252 seconds]

08:38 dddddd has joined #racket

08:40 orivej has quit [Ping timeout: 252 seconds]

08:43 vraid has quit [Ping timeout: 245 seconds]

08:51 ubLIX has quit [Ping timeout: 250 seconds]

09:18 Diagon has joined #racket

09:19 selimcan has joined #racket

09:20 orivej has joined #racket

09:21 Diagon has quit [Client Quit]

09:25 dmiles has quit [Ping timeout: 245 seconds]

09:26 Diagon has joined #racket

09:33 dmiles has joined #racket

09:36 dddddd_ has joined #racket

09:36 dddddd has quit [Ping timeout: 252 seconds]

09:37 dddddd_ is now known as dddddd

09:50 vraid has joined #racket

09:51 Diagon has quit [Quit: Leaving]

10:03 lockywolf has joined #racket

10:18 Diagon has joined #racket

10:38 orivej has quit [Ping timeout: 246 seconds]

10:40 orivej has joined #racket

11:11 notzmv has quit [Ping timeout: 244 seconds]

11:15 ZombieChicken has quit [Ping timeout: 256 seconds]

11:26 juanfra has quit [Disconnected by services]

11:31 Guest56129 has joined #racket

12:14 ym555 has joined #racket

12:21 crsc has joined #racket

12:21 <crsc> hi

12:21 acarrico has joined #racket

12:24 YuGiOhJCJ has joined #racket

12:56 jao has joined #racket

13:12 Guest56129 has quit [Ping timeout: 252 seconds]

13:21 Diagon has quit [Quit: Leaving]

13:28 ym555 has quit [Quit: leaving...]

13:34 pierpal has joined #racket

13:43 YuGiOhJCJ has quit [Quit: YuGiOhJCJ]

13:53 ma_ has joined #racket

13:53 ma_ has quit [Client Quit]

13:54 ma_ has joined #racket

13:56 ma_ has quit [Client Quit]

13:56 spdegabrielle has joined #racket

13:56 ma_ has joined #racket

13:57 <spdegabrielle> Hi,

13:57 <spdegabrielle> Would anyone be interested in an informal Racket meetup in London?

13:57 <spdegabrielle> Any preference for date/time?

13:57 <spdegabrielle> For a location I’m thinking about ‘The Microsoft Reactor London - 70 Wilson St, London EC2A 2DB’ as it appears to be free and relatively central.

13:57 <spdegabrielle> https://developer.microsoft.com/en-us/reactor/Form/5

13:57 <spdegabrielle> Kind regards,

13:57 <spdegabrielle> Stephen

13:57 <spdegabrielle> spdegabrielle@gmail.com

13:57 <spdegabrielle> https://www.irccloud.com/pastebin/tSAXNBTb

13:58 ma_ has quit [Client Quit]

13:59 ma_ has joined #racket

14:13 ma_ has quit [Quit: My MacBook has gone to sleep. ZZZzzz…]

14:33 q9929t has joined #racket

14:41 q9929t has quit [Quit: q9929t]

14:47 juanfra has joined #racket

15:15 Fare has joined #racket

15:50 <dustyweb> hey spdegabrielle

15:51 <dustyweb> not in london but always exciting to hear more people working on organizing such things

16:05 endformationage has joined #racket

16:05 ng0 has joined #racket

16:08 pera has joined #racket

16:12 notzmv has joined #racket

16:15 lockywolf has quit [Ping timeout: 245 seconds]

16:18 selimcan has quit [Ping timeout: 246 seconds]

16:18 aeth has quit [Ping timeout: 252 seconds]

16:20 aeth has joined #racket

16:23 vraid has quit [Quit: Leaving]

16:47 Fare has quit [Ping timeout: 245 seconds]

16:49 widp_ has joined #racket

16:52 efm has joined #racket

17:02 orivej has quit [Ping timeout: 240 seconds]

17:07 pierpal has quit [Quit: Poof]

17:07 pierpal has joined #racket

17:14 orivej has joined #racket

17:26 pierpal has quit [Quit: Poof]

17:26 pierpal has joined #racket

17:27 orivej has quit [Ping timeout: 245 seconds]

17:30 efm has quit [Ping timeout: 240 seconds]

17:35 efm has joined #racket

17:45 efm has quit [Remote host closed the connection]

17:45 efm has joined #racket

17:55 spdegabrielle has quit [Quit: Connection closed for inactivity]

17:58 dan_f has joined #racket

18:24 selimcan has joined #racket

18:31 pera has quit [Ping timeout: 245 seconds]

18:36 YuGiOhJCJ has joined #racket

18:51 pera has joined #racket

19:11 pierpal has quit [Quit: Poof]

19:11 pierpal has joined #racket

19:14 <selimcan> Looks like as if someone is trolling the user mailing list or misinterpreted the name of this language

19:26 FreeFull has joined #racket

19:37 ubLIX has joined #racket

19:42 jao has quit [Ping timeout: 245 seconds]

20:06 pera has quit [Ping timeout: 245 seconds]

20:06 acarrico has quit [Ping timeout: 268 seconds]

20:09 zmt01 has joined #racket

20:12 zmt00 has quit [Ping timeout: 240 seconds]

20:12 orivej has joined #racket

20:15 pera has joined #racket

20:21 selimcan has quit [Ping timeout: 246 seconds]

20:25 selimcan has joined #racket

20:26 ng0 has quit [Remote host closed the connection]

20:32 selimcan has quit [Remote host closed the connection]

20:41 ng0 has joined #racket

20:52 aeth has quit [Ping timeout: 246 seconds]

20:54 aeth has joined #racket

21:00 aeth has quit [Ping timeout: 245 seconds]

21:01 aeth has joined #racket

21:03 pierpal has quit [Ping timeout: 252 seconds]

21:06 aeth has quit [Ping timeout: 240 seconds]

21:07 aeth has joined #racket

21:12 ZombieChicken has joined #racket

21:13 efm has quit [Ping timeout: 268 seconds]

21:17 efm has joined #racket

21:21 ng0 has quit [Remote host closed the connection]

21:22 ng0 has joined #racket

21:22 efm has quit [Read error: Connection reset by peer]

21:24 efm has joined #racket

21:26 amz3 has quit [Quit: WeeChat 2.2]

21:34 Fare has joined #racket

21:37 aeth has quit [Ping timeout: 244 seconds]

21:39 aeth has joined #racket

21:45 acarrico has joined #racket

21:51 ym555 has joined #racket

22:12 Fare has quit [Ping timeout: 246 seconds]

22:17 efm has quit [Read error: Connection reset by peer]

22:34 vraid has joined #racket

22:55 <jboy> It feels weird to have this helper function in my code: (define (true? x) (not (false? x)))

22:56 <jboy> What would be the idiomatic way to check for trueness?

22:57 <rain1> in scheme you usually check for #t rather than "trueness"

22:57 <rain1> oh no thats wrong i got it negated

22:57 <rain1> what you have is correct

23:04 acarrico has quit [Ping timeout: 255 seconds]

23:09 <lexi-lambda> jboy: What rain1 said is right, you usually just treat #f as false and everything else as true, so there isn’t usually much reason to explicitly convert non-#f values to #t. But if you have to for some reason, the idiomatic pattern is to write `(and x #t)`. (Personally, I’m not sure this is actually a great idiom, but hey, I’m just the messenger.)

23:11 <jboy> Thanks lexi-lambda and rain1. I want to filter all occurrences of #f out of a list, and with my helper function I can just do (filter true? lst)

23:11 <lexi-lambda> jboy: You can also just do (filter identity lst) since `filter` treats everything that isn’t `#f` as true (as is idiomatic).

23:12 <lexi-lambda> Or (filter values lst) if you don’t want to import racket/function. `values` happens to be the identity function when given one argument.

23:12 pierpal has joined #racket

23:12 <jboy> Ah, nice. I was just wondering wither (filter-not false? lst) would be more idiomatic, but you saved me from insanity.

23:12 <lexi-lambda> (filter values lst) is a pretty common idiom.

23:16 pierpal has quit [Ping timeout: 255 seconds]

23:22 jao has joined #racket

23:36 orivej has quit [Ping timeout: 245 seconds]

23:38 dan_f has quit [Quit: dan_f]

23:55 ubLIX has quit [Quit: ubLIX]

23:56 jao has quit [Ping timeout: 245 seconds]